Yes, Kaleigh as a puppy had that. When a puppy is growing, they have limbs that aren't as sturdy or mature yet. They bounce around, they check out their environment and don't always understand or have the experience and will get into situations where they twist or hit or squirm in awkward movements. There are genetic abnormalities that can be passed, but when it is a puppy the best advice I got was watch it. Until the puppy limbs mature they can pull them, twist them, or bruise them. Kaleigh was a runner and she was constantly running into things in her awkward growth spurts. Her coordination wasn't quite in sync. So I had her checked when she bashed into something, which for her was a lot. Thankfully my Vet had raised collies, and I guess they do that as well as puppies, so he was familiar with it. Kaleigh survived her rambunctious puppyhood with no complications. Her limbs grew stronger and she didn't have any further issues. It was the back right leg that she constantly compromised. Funny, my Vet NEVER took x-rays, he could feel it, but then he knew the condition well. And he showed me what to look for on her. By the time she had her first bday, her legs were strong and properly formed. It wasn't an issue. Do your research, limit activity if there is limping, and always get a second opinion before any invasive procedure.